RFR: 8268225: Support :focus-visible and :focus-within CSS pseudoclasses [v10]

[Michael Strauß]

On Wed, 6 Jul 2022 23:36:26 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> This PR adds the `Node.focusVisible` and `Node.focusWithin` properties, as well as the corresponding `:focus-visible` and `:focus-within` CSS pseudo-classes.
>
> Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:
> 
>   address review comments

I've finalized the CSR.
I hope this PR can attract a timely second review in order to make it into JFX 19.

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PR: https://git.openjdk.org/jfx/pull/475